So finally byuu emulated the last chip on Snes hardware family which was the ST018 ARMv3 coprocessor. If byuu says that he reached 100% of known compatibility then we can "translate" that to "as close as it can humanly get" 
here is what he had to say for this release of bsnes (v0.87) and don't miss out on his links to the related articles!
here is what he had to say for this release of bsnes (v0.87) and don't miss out on his links to the related articles!